Adam da

13 Questions 11 Answers 0 Followers

Questions related from Adam da

Best way to measure the thickness/flatness of a wood board?

Hi, Does anyone here know of a tool or technique to measure the thickness of MDF across the entire board (4'x8') non-destructively? I currently cut up the board into 40 pieces and using a...

31 May 2022 2,532 0 View

Where could one buy self-healing polymer resin/films/sheets on an industrial scale?

Hi, I've browsed around and couldn't find any companies selling self-healing polymers on a commercial scale. Would anyone here happen to know?

14 August 2021 624 3 View

Which peak should I consider when calculating ZIF-8's crystalline size from XRD?

Hello, Using the Scherrer's equation, one could calculate, roughly, the crystalline size of ZIF-8. However, I am confused as to which peak in the XRD pattern should be taken for the calculation?...

11 January 2021 9,035 3 View

At what temperature does graphene oxide start to reduce?

Hello, I am wondering if using temperatures up to 65 C reduce graphene oxide at all. I currently fabricate graphene oxide membranes from a water dispersion (heat up to 40 C during sonication). I...

16 September 2020 6,889 12 View

How to prevent graphene oxide agglomeration after film drying?

Hello, I am making a graphene oxide/polymer composite membrane using spin-coating. When the precursor solution is made (blending and sonication of polymer with graphene oxide, followed by...

14 July 2020 6,783 13 View

How to produce defect free graphene oxide layer onto a porous support?

Hello, Following many procedures, I am spin coating a 1mg/ml GO in water suspension onto a nylon membrane, repeated 5 times (3000rpm, 30sec). However, there still seems to be defects, as the gas...

23 October 2019 3,737 3 View

Are cyclosiloxanes UV stable?

Hello, Are cyclosiloxanes stable under UV light (240-400 nm range)? I know that siloxane bonds are UV stable, but being in a ring (in my case a cyclotetrasiloxane), the bonds are easier to...

10 September 2019 8,554 0 View

Can you prove that a cyclosiloxane compound does not have its ring opened by Si NMR?

Hello, I am synthesizing a material based on a cyclosiloxane compound, where I am attaching functional groups onto the silicon atoms. My worry is that the siloxane ring could open during the...

08 August 2019 4,733 2 View

What is the reason I cannot separate my siloxane material properly using column chromatography?

hello, I am trying to separate a star shaped siloxane polymer from starting material using column with some luck. Using 70/30 hexane/EA, I can get my product but with a few problems: 1- The...

15 July 2019 2,481 2 View

What side products can you expect from hydrosilylation reaction with styrenes?

Hello, I am trying to purify a reaction product of hydrosilylation with a styrene compound using Karstedt's catalyst. However, it seems to be cumbersome for the following reason. After...

09 April 2019 1,807 2 View

How can I make a poly (ethylene-co-vinyl alcohol), EVOH, membrane flexible?

Hello, I am using phase inversion to make EVOH membranes, using DMSO as a solvent and ethanol as a non-solvent. When the membrane is wet it is flexible and stretchable. However, once I dry it in...

26 November 2018 7,091 0 View

How can I remove EVOH from a glass plate?

Hello, I prepared a poly(ethylene-co-vinyl alcohol) membrane via phase inversion by casting on a glass plate. What is a good way to remove it from glass without damaging the membrane?

15 November 2018 533 4 View

Why does my PDMS layer exhibit a low permeability?

Hello, I am spin coating PDMS onto porous LDPE. However, when I test the permeability to air, it shows a low permeance rate. My method is as follows: -Dissolve Sylgard base and curing agent in...

12 November 2018 9,721 0 View